The areas of two similar triangles \( \mathrm{PQR} \) and \( \mathrm{ABC} \) are in the ratio \(...

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The areas of two similar triangles \( \mathrm{PQR} \) and \( \mathrm{ABC} \) are in the ratio \( 9: 16 \). If \( B C=8 \mathrm{~cm} \), then the length of \( \mathrm{QR} \) is
a. \( 4 \mathrm{~cm} \)
b. \( 4.5 \mathrm{~cm} \)
c. \( 3 \mathrm{~cm} \)
d. \( 6 \mathrm{~cm} \)
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